Serialize AppSync acceptance tests

[ewbankkit]

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Many of our AppSync acceptance tests fail in CI with a quota-exceeded error:

=== RUN   TestAccAppSyncGraphQLAPI_OpenIDConnect_iatTTL
=== PAUSE TestAccAppSyncGraphQLAPI_OpenIDConnect_iatTTL
=== CONT  TestAccAppSyncGraphQLAPI_OpenIDConnect_iatTTL
graphql_api_test.go:486: Step 1/3 error: Error running apply: exit status 1
Error: error creating AppSync GraphQL API: ApiLimitExceededException: The service limit for number of GraphQL APIs has been reached.
on terraform_plugin_test.tf line 2, in resource "aws_appsync_graphql_api" "test":
2: resource "aws_appsync_graphql_api" "test" {
--- FAIL: TestAccAppSyncGraphQLAPI_OpenIDConnect_iatTTL (45.80s)

Look into serializing.

[github-actions]

This functionality has been released in v3.64.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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